A thin copper wire of length l metre increases in length by $ 2\%$ when heated through $10^o C$. ......... $\%$ is the percentage increase in area when a square copper sheet of length $l$ metre is heated through $10^o C$
A thin copper wire of length l metre increases in length by $ 2\%$ when heated through $10^o C$. ......... $\%$ is the percentage increase in area when a square copper sheet of length $l$ metre is heated through $10^o C$
$4$
$8$
$16$
None of the above
A thin copper wire of length l metre increases in length by $ 2\%$ when heated through $10^o C$. ......... $\%$ is the percentage increase in area when a square copper sheet of length $l$ metre is heated through $10^o C$
Since percentage increase in length $= 2 \%$
Hence, percentage increase in area of square sheet $ = 2 \times 2\% $ $= 4\%$
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